A federal court Tuesday struck down Arizona's ban on abortions after 20 weeks of pregnancy absent a medical emergency.

The 9th U.S. Circuit Court of Appeals said the law violated a woman's
constitutionally protected right to terminate a pregnancy before a
fetus is able to survive outside the womb. "Viability" of a fetus is
generally considered to start at 24 weeks. Normal pregnancies run about
40 weeks.